Added makefile and updated whether a column could be null

Makefile

@@ -0,0 +1,58 @@
+# Makefile for Oakville and Milton Humane Society Project
+.PHONY: lint format migration generate-migration start-docker stop-docker clean-db seed-db read-tables read-table help 
+
+# Linting & Formatting
+lint:
+	docker exec -it humane_society_backend /bin/bash -c "yarn lint"
+	docker exec -it humane_society_frontend /bin/bash -c "yarn lint"
+
+format:
+	docker exec -it humane_society_backend /bin/bash -c "yarn fix"
+	docker exec -it humane_society_frontend /bin/bash -c "yarn fix"
+
+# Database Migrations
+migration:
+	docker exec -it humane_society_backend /bin/bash -c "node migrate up"
+
+generate-migration:
+	docker exec -it humane_society_backend /bin/bash -c "node migrate create --name $(name).ts"
+
+# Docker Commands
+start-docker:
+	docker-compose up --build
+
+stop-docker:
+	docker-compose down
+
+# Database Operations
+clean-db:
+	docker exec -it humane_society_backend /bin/bash -c "node migrate down && node migrate up"
+
+# Seeding script has not been created yet
+seed-db:
+# docker exec -it humane_society_backend /bin/bash -c "node seed"
+
+# Acessing Postgres DB
+read-tables: 
+	docker exec -it humane_society_db /bin/bash -c "\
+    psql -U postgres -d humane_society_dev -c '\dt';"
+
+read-table:
+	docker exec -it humane_society_db /bin/bash -c "\
+    psql -U postgres -d humane_society_dev -c '\dt'; \
+    psql -U postgres -d humane_society_dev -c 'SELECT * FROM $(TABLE);'"
+
+# Help
+help:
+	@echo Available targets or actions:
+	@echo lint               Lint the code
+	@echo format             Format the code
+	@echo migration          Run database migrations
+	@echo generate-migration Generate a new migration 
+	@echo start-docker       Start Docker containers
+	@echo stop-docker        Stop Docker containers
+	@echo read-tables        See all database tables
+	@echo read-table         See a single table
+	@echo clean-db           Clean the database and rerun migrations
+	@echo seed-db            The database seeding script has yet to be implemented
+	@echo help               Show this help message

backend/typescript/migrations/2024.06.15T17.13.39.add-user-columns.ts

@@ -4,7 +4,7 @@ import { Migration } from "../umzug";
 export const up: Migration = async ({ context: sequelize }) => {
   await sequelize.getQueryInterface().addColumn("users", "email", {
     type: DataType.STRING,
-    allowNull: false,
+    allowNull: true,
   });
 
   await sequelize.getQueryInterface().addColumn("users", "skill_level", {